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实验采用2种方法:(1)添加合金元素以降低第二相熔点,促进W向粘结相中扩散和溶解(又称活化液相烧结);(2)将原始混合粉末高能球磨(又称机械合金化)。实验结果表明:添加合金元素Co可起到活化液相烧结的作用,烧结温度可降低30℃~50℃,同时可提高和稳定性能;Mn的熔点虽低,但不能满足溶解度要求,没有起到活化烧结作用;高能球磨综合了细晶活化、机械活化和预合金化等机制,使烧结温度降低到第二相熔点(1465℃)下,同时具有高的拉伸性能,较好地实现了强化烧结。
The experiment adopts two kinds of methods: (1) adding alloying elements to lower the melting point of the second phase, promoting W to diffuse and dissolve in the binder phase (also known as activating liquid phase sintering); (2) mixing the original mixed powder high energy ball mill Mechanical alloying). The experimental results show that adding alloying element Co can activate the liquid phase sintering, the sintering temperature can be reduced by 30 ℃ ~ 50 ℃, while the stability and stability can be improved. Although the melting point of Mn is low, it can not meet the solubility requirements, Activation sintering; high-energy ball milling combined fine-grained activation, mechanical activation and pre-alloying mechanism, the sintering temperature is reduced to the second phase melting point (1465 ℃), at the same time with high tensile properties, the better the enhanced sintering.